tracing: Modify print_fields() for fields output order

Now the print_fields() print trace event fields in reverse order. Modify
it to the positive sequence.

Example outputs for a user event:
	test0 u32 count1; u32 count2

Output before:
	example-2547    [000] .....   325.666387: test0: count2=0x2 (2) count1=0x1 (1)

Output after:
	example-2742    [002] .....   429.769370: test0: count1=0x1 (1) count2=0x2 (2)

Link: https://lore.kernel.org/linux-trace-kernel/20230525085232.5096-1-sunliming@kylinos.cn
Fixes: 80a76994b2d88 ("tracing: Add "fields" option to show raw trace event fields")
Signed-off-by: sunliming <sunliming@kylinos.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 15f05faaae44dd7dbf870192dd3d153cf0c4f8f0..1e33f367783eb3502b33e5c329ca53a1cae1ca1d 100644 (file)
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -847,7 +847,7 @@ static void print_fields(struct trace_iterator *iter, struct trace_event_call *c
        int ret;
        void *pos;
 
-       list_for_each_entry(field, head, link) {
+       list_for_each_entry_reverse(field, head, link) {
                trace_seq_printf(&iter->seq, " %s=", field->name);
                if (field->offset + field->size > iter->ent_size) {
                        trace_seq_puts(&iter->seq, "<OVERFLOW>");